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Numerical simulations of a stick-slip spherical particle in Poiseuille flow

机译：Poiseuille流量中粘性球形粒子的数值模拟

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摘要

The dynamics of a stick-slip "Janus" spherical particle suspended in a Newtonian fluid flowing in a cylindrical microchannel is studied by direct numerical simulations. Partial slip is imposed on half of the particle surface, whereas the no-slip boundary condition is present on the other half. The finite element method is used to solve the balance equations under creeping flow conditions. The translational and rotational velocities of the particle are evaluated at several orientations and distances from the tube centerline. The trajectories are then reconstructed by solving the kinematic equations where the velocities are taken by interpolating the simulation data. The particle dynamics is investigated by varying the initial position and orientation, the slip parameter, and the confinement ratio. The results, presented in terms of particle trajectories and phase portraits, highlight the existence of two relevant regimes: a periodic oscillation or a migration toward the tube axis for particle positions sufficiently far from or near the centerline, respectively. The basin of attraction of the tube axis grows with particle confinement and slip coefficient although the dynamics is qualitatively unaffected. Published under license by AIP Publishing.
机译：通过直接数值模拟研究悬浮在圆柱形微通道中流动的牛顿流体中悬浮在牛顿微通道的牛顿流体中的粘隙“Janus”球粒子的动态。局部滑动施加在颗粒表面的一半上，而无滑移边界条件存在于另一半。有限元方法用于解决蠕动流动条件下的平衡方程。颗粒的平移和旋转速度在几个取向和距离管中心线的距离下进行评估。然后通过求解通过插入模拟数据来拍摄速度的运动方程来重建轨迹。通过改变初始位置和方向，滑移参数和限制比来研究粒子动力学。在粒子轨迹和相位肖像方面提出的结果突出了两个相关制度的存在：分别具有足够远离或附近中心线的粒子位置的周期性振荡或朝向管轴的迁移。管轴的吸引力源于粒子限制和滑移系数，尽管动态不受影响。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共10页
  • 作者

    Trofa Marco; DAvino Gaetano; Maffettone Pier Luca;

  • 作者单位

    Univ Napoli Federico II Dipartimento Ingn Chim Mat &

    Prod Ind Piazza Giorgio Ascarelli 80 I-80125 Naples Italy;

    Univ Napoli Federico II Dipartimento Ingn Chim Mat &

    Prod Ind Piazza Giorgio Ascarelli 80 I-80125 Naples Italy;

    Univ Napoli Federico II Dipartimento Ingn Chim Mat &

    Prod Ind Piazza Giorgio Ascarelli 80 I-80125 Naples Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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